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                云计算<span class="caret"></span>
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                <li><a href="#">linux</a></li>
                <li><a href="#">db</a></li>
                <li><a href="#">python</a></li>
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        <li><a href="#">Python</a></li>
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        <li><a href="#">Python</a></li>
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        <li class="active"><a href="#">Linux</a></li>
        <li><a href="#">DB</a></li>
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